Meet Crystalcal — Ten quick drills. Calibrate your gut
Crystalcal is the daily calibration training routine.
Education
Crystalcal
Ten quick drills. Calibrate your gut.
Every feature, from the first launch.
No account, no login, no cloud. Everything runs on your device and works fully offline — nothing in this post is hidden behind a wall.
What Crystalcal does
Crystalcal is the daily calibration training routine. Ten known-answer drills per session — coin flips, geography facts, dice rolls. You assign probabilities; the app scores you with the log score. Across many sessions, you watch your calibration tighten.
A look inside
Tap any screenshot to open the full-resolution version.
What's inside
- Today — Tab Today
- About — Tab About
Why we built it
Forecasting is a learnable skill but consumer practice tools are nonexistent. Crystalcal is the daily drill.
What makes it different
Pure drill format. Not Metaculus. Not Good Judgment Open.
Who it's for
Students, parents helping with homework, and adults who just want a fast answer without an upsell.
In one line: Ten quick drills. Calibrate your gut.
Try it
See the Crystalcal app page for the full feature list, the info table, and support links.
Use Crystalcal, found a bug, or have a feature request? Comments are open below — anonymous is fine.
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